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Groups > linux.kernel > #1725761
| From | Michal Nazarewicz <mina86@mina86.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH 27/31] usb/gadget/snps_udc_core: Move timer initialization earlier |
| Date | 2017-09-03 23:20 +0200 |
| Message-ID | <ulKtb-50X-9@gated-at.bofh.it> (permalink) |
| References | <ukHe1-3XZ-3@gated-at.bofh.it> <ukHnI-41L-25@gated-at.bofh.it> |
| Organization | http://mina86.com/ |
On Thu, Aug 31 2017, Kees Cook wrote:
> With timer initialization made earlier at the start, there is no reason
> to make del_timer_sync() calls conditionally, there by removing the
> assignments and tests of the .data field.
>
> Cc: Felipe Balbi <balbi@kernel.org>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: Raviteja Garimella <raviteja.garimella@broadcom.com>
> Cc: Michal Nazarewicz <mina86@mina86.com>
> Cc: "Gustavo A. R. Silva" <garsilva@embeddedor.com>
> Cc: linux-usb@vger.kernel.org
> Signed-off-by: Kees Cook <keescook@chromium.org>
> ---
> drivers/usb/gadget/udc/snps_udc_core.c | 16 +++++-----------
> 1 file changed, 5 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/usb/gadget/udc/snps_udc_core.c b/drivers/usb/gadget/udc/snps_udc_core.c
> index 5460e5ba1c3c..1607e901e16b 100644
> --- a/drivers/usb/gadget/udc/snps_udc_core.c
> +++ b/drivers/usb/gadget/udc/snps_udc_core.c
> @@ -3067,14 +3067,12 @@ void udc_remove(struct udc *dev)
> stop_timer++;
> if (timer_pending(&udc_timer))
> wait_for_completion(&on_exit);
> - if (udc_timer.data)
> - del_timer_sync(&udc_timer);
> + del_timer_sync(&udc_timer);
> /* remove pollstall timer */
> stop_pollstall_timer++;
> if (timer_pending(&udc_pollstall_timer))
> wait_for_completion(&on_pollstall_exit);
> - if (udc_pollstall_timer.data)
> - del_timer_sync(&udc_pollstall_timer);
> + del_timer_sync(&udc_pollstall_timer);
> udc = NULL;
> }
> EXPORT_SYMBOL_GPL(udc_remove);
> @@ -3164,9 +3162,9 @@ int udc_probe(struct udc *dev)
> u32 reg;
> int retval;
>
> - /* mark timer as not initialized */
> - udc_timer.data = 0;
> - udc_pollstall_timer.data = 0;
> + /* timer init */
> + setup_timer(&udc_timer, udc_timer_function, 0);
> + setup_timer(&udc_pollstall_timer, udc_pollstall_timer_function, 0);
>
> /* device struct setup */
> dev->gadget.ops = &udc_ops;
> @@ -3206,10 +3204,6 @@ int udc_probe(struct udc *dev)
> if (retval)
> goto finished;
>
> - /* timer init */
> - setup_timer(&udc_timer, udc_timer_function, 1);
> - setup_timer(&udc_pollstall_timer, udc_pollstall_timer_function, 1);
> -
> /* set SD */
> reg = readl(&dev->regs->ctl);
> reg |= AMD_BIT(UDC_DEVCTL_SD);
Stupid question, is the check in udc_remove even necessary?
udc_probe is called from udc_plat_probe:
if (udc_probe(udc)) {
ret = -ENODEV;
goto exit_dma;
}
If the call fails, udc_plat_probe cleans up after itself and noticeably
*does not* call udc_remove. As far as I understand, if probe callback
fails, remove callback is *not* called. Meanwhile, udc_remove is called
from the remove callback which is udc_plat_remove. So, udc_remove can
be called only if udc_probe succeeds.
It seems to me that a better patch is:
--- a/drivers/usb/gadget/udc/snps_udc_core.c
+++ b/drivers/usb/gadget/udc/snps_udc_core.c
@@ -3067,14 +3067,12 @@ void udc_remove(struct udc *dev)
stop_timer++;
if (timer_pending(&udc_timer))
wait_for_completion(&on_exit);
- if (udc_timer.data)
- del_timer_sync(&udc_timer);
+ del_timer_sync(&udc_timer);
/* remove pollstall timer */
stop_pollstall_timer++;
if (timer_pending(&udc_pollstall_timer))
wait_for_completion(&on_pollstall_exit);
- if (udc_pollstall_timer.data)
- del_timer_sync(&udc_pollstall_timer);
+ del_timer_sync(&udc_pollstall_timer);
udc = NULL;
}
EXPORT_SYMBOL_GPL(udc_remove);
@@ -3164,9 +3162,9 @@ int udc_probe(struct udc *dev)
u32 reg;
int retval;
- /* mark timer as not initialized */
- udc_timer.data = 0;
- udc_pollstall_timer.data = 0;
-
/* device struct setup */
dev->gadget.ops = &udc_ops;
--
Best regards
ミハウ “𝓶𝓲𝓷𝓪86” ナザレヴイツ
«If at first you don’t succeed, give up skydiving»
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[PATCH 00/31] struct timer_list callback argument conversion, step 1 Kees Cook <keescook@chromium.org> - 2017-09-01 01:40 +0200
[PATCH 01/31] coccinelle: Improve setup_timer.cocci matching Kees Cook <keescook@chromium.org> - 2017-09-01 01:40 +0200
[PATCH 16/31] usb/phy-isp1301-omap: Remove .data assignment Kees Cook <keescook@chromium.org> - 2017-09-01 01:40 +0200
[PATCH 10/31] timer: Remove users of expire and data arguments to DEFINE_TIMER Kees Cook <keescook@chromium.org> - 2017-09-01 01:40 +0200
[PATCH 04/31] timer: Remove init_timer_on_stack() in favor of setup_timer_on_stack() Kees Cook <keescook@chromium.org> - 2017-09-01 01:40 +0200
[PATCH 15/31] timer: Additional init_timer() -> setup_timer() conversions Kees Cook <keescook@chromium.org> - 2017-09-01 01:40 +0200
[PATCH 09/31] timer: Remove unused static initializer macros Kees Cook <keescook@chromium.org> - 2017-09-01 01:40 +0200
[PATCH 08/31] timer: Remove users of TIMER_INITIALIZER Kees Cook <keescook@chromium.org> - 2017-09-01 01:40 +0200
[PATCH 03/31] timer: Remove init_timer_pinned_deferrable() in favor of setup_pinned_deferrable_timer() Kees Cook <keescook@chromium.org> - 2017-09-01 01:40 +0200
[PATCH 07/31] timer: Remove users of TIMER_DEFERRED_INITIALIZER Kees Cook <keescook@chromium.org> - 2017-09-01 01:40 +0200
[PATCH 12/31] timer: Remove expires argument from __TIMER_INITIALIZER() Kees Cook <keescook@chromium.org> - 2017-09-01 01:40 +0200
[PATCH 18/31] scsi/aic7xxx: Clean up timer usage Kees Cook <keescook@chromium.org> - 2017-09-01 01:40 +0200
[PATCH 30/31] appletalk: Remove unneeded synchronization Kees Cook <keescook@chromium.org> - 2017-09-01 01:40 +0200
[PATCH 06/31] timer: Remove init_timer_deferrable() in favor of setup_deferrable_timer() Kees Cook <keescook@chromium.org> - 2017-09-01 01:40 +0200
[PATCH 11/31] timer: Remove expires and data arguments from DEFINE_TIMER Kees Cook <keescook@chromium.org> - 2017-09-01 01:40 +0200
Re: [PATCH 11/31] timer: Remove expires and data arguments from DEFINE_TIMER Geert Uytterhoeven <geert@linux-m68k.org> - 2017-09-01 09:30 +0200
[PATCH 05/31] timer: Remove init_timer_pinned() in favor of setup_pinned_timer() Kees Cook <keescook@chromium.org> - 2017-09-01 01:40 +0200
[PATCH 17/31] media/i2c/tc358743: Initialize timer Kees Cook <keescook@chromium.org> - 2017-09-01 01:40 +0200
[PATCH 24/31] mips/sgi-ip22: Use separate static data field with with static timer Kees Cook <keescook@chromium.org> - 2017-09-01 01:40 +0200
Re: [PATCH 24/31] mips/sgi-ip22: Use separate static data field with with static timer Ralf Baechle <ralf@linux-mips.org> - 2017-09-01 09:10 +0200
Re: [PATCH 24/31] mips/sgi-ip22: Use separate static data field with with static timer Kees Cook <keescook@chromium.org> - 2017-09-01 19:00 +0200
Re: [PATCH 24/31] mips/sgi-ip22: Use separate static data field with with static timer Ralf Baechle <ralf@linux-mips.org> - 2017-09-02 01:00 +0200
[PATCH 13/31] timer: Remove meaningless .data/.function assignments Kees Cook <keescook@chromium.org> - 2017-09-01 01:40 +0200
Re: [PATCH 13/31] timer: Remove meaningless .data/.function assignments Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-09-01 07:10 +0200
Re: [PATCH 13/31] timer: Remove meaningless .data/.function assignments Krzysztof Halasa <khc@pm.waw.pl> - 2017-09-01 20:10 +0200
Re: [PATCH 13/31] timer: Remove meaningless .data/.function assignments Jens Axboe <axboe@kernel.dk> - 2017-09-01 22:10 +0200
[PATCH 28/31] infiniband/rdmavt: Remove redundant timer initialization Kees Cook <keescook@chromium.org> - 2017-09-01 01:50 +0200
[PATCH 22/31] sparc/led: Use separate static data field with with static timer Kees Cook <keescook@chromium.org> - 2017-09-01 01:50 +0200
Re: [PATCH 31/31] timer: Switch to testing for .function instead of .data Dmitry Torokhov <dmitry.torokhov@gmail.com> - 2017-09-01 01:50 +0200
Re: [PATCH 31/31] timer: Switch to testing for .function instead of .data Kees Cook <keescook@chromium.org> - 2017-09-01 02:00 +0200
Re: [PATCH 31/31] timer: Switch to testing for .function instead of .data Dmitry Torokhov <dmitry.torokhov@gmail.com> - 2017-09-01 03:10 +0200
[PATCH 23/31] mips/sgi-ip32: Use separate static data field with with static timer Kees Cook <keescook@chromium.org> - 2017-09-01 01:50 +0200
Re: [PATCH 23/31] mips/sgi-ip32: Use separate static data field with with static timer Ralf Baechle <ralf@linux-mips.org> - 2017-09-01 09:10 +0200
Re: [PATCH 23/31] mips/sgi-ip32: Use separate static data field with with static timer Ralf Baechle <ralf@linux-mips.org> - 2017-09-02 01:00 +0200
[PATCH 20/31] net/core: Collapse redundant sk_timer callback data assignments Kees Cook <keescook@chromium.org> - 2017-09-01 01:50 +0200
[PATCH 27/31] usb/gadget/snps_udc_core: Move timer initialization earlier Kees Cook <keescook@chromium.org> - 2017-09-01 01:50 +0200
Re: [PATCH 27/31] usb/gadget/snps_udc_core: Move timer initialization earlier Michal Nazarewicz <mina86@mina86.com> - 2017-09-03 23:20 +0200
Re: [PATCH 27/31] usb/gadget/snps_udc_core: Move timer initialization earlier Kees Cook <keescook@chromium.org> - 2017-09-07 01:30 +0200
[PATCH 21/31] s390/char/sclp: Use separate static data field with with static timer Kees Cook <keescook@chromium.org> - 2017-09-01 01:50 +0200
[PATCH 29/31] scsi/bnx2i: Initialize timer Kees Cook <keescook@chromium.org> - 2017-09-01 01:50 +0200
[PATCH 19/31] timer: Remove open-coded casts for .data and .function Kees Cook <keescook@chromium.org> - 2017-09-01 01:50 +0200
Re: [PATCH 19/31] timer: Remove open-coded casts for .data and .function Tyrel Datwyler <tyreld@linux.vnet.ibm.com> - 2017-09-01 02:30 +0200
Re: [PATCH 19/31] timer: Remove open-coded casts for .data and .function Tyrel Datwyler <turtle.in.the.kernel@gmail.com> - 2017-09-01 02:30 +0200
[PATCH 25/31] net/atm/mpc: Use separate static data field with with static timer Kees Cook <keescook@chromium.org> - 2017-09-01 01:50 +0200
[PATCH 31/31] timer: Switch to testing for .function instead of .data Kees Cook <keescook@chromium.org> - 2017-09-01 01:50 +0200
Re: [PATCH 31/31] timer: Switch to testing for .function instead of .data Jeff Kirsher <jeffrey.t.kirsher@intel.com> - 2017-09-01 23:40 +0200
Re: [PATCH 31/31] timer: Switch to testing for .function instead of .data "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2017-09-02 16:00 +0200
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