From: Suzuki K Poulose <suzuki.poulose@arm.com>
To: Leo Yan <leo.yan@linaro.org>,
Mathieu Poirier <mathieu.poirier@linaro.org>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org,
Coresight ML <coresight@lists.linaro.org>
Cc: Mike Leach <mike.leach@linaro.org>,
Robert Walker <robert.walker@arm.com>
Subject: Re: [PATCH] coresight: tmc: Fix bad register address for CLAIM
Date: Fri, 19 Oct 2018 09:39:15 +0100 [thread overview]
Message-ID: <9b6a508d-5c4b-ffd8-7f6b-3f4e6db26571@arm.com> (raw)
In-Reply-To: <1539924983-18503-1-git-send-email-leo.yan@linaro.org>
Hi Leo,
On 10/19/2018 05:56 AM, Leo Yan wrote:
> Commit 4d3ebd3658d8 ("coreisght: tmc: Claim device before use") uses
> CLAIM tag to validate if the device is available, it needs to pass
> the device base address to access related registers.
>
> In the function tmc_etb_disable_hw() it wrongly passes the driver data
> pointer as register base address, thus it's easily to produce the kernel
> warning info like below:
>
> [ 83.579898] WARNING: CPU: 4 PID: 2970 at drivers/hwtracing/coresight/coresight.c:207 coresight_disclaim_device_unlocked+0x44/0x80
> [ 83.591448] Modules linked in:
> [ 83.594485] CPU: 4 PID: 2970 Comm: uname Not tainted 4.19.0-rc6-00417-g721b509 #110
Oops! Thanks for fixing !
>
> This patch is to fix this bug by using 'drvdata->base' as the
> register base address for CLAIM related operation.
>
> Fixes: 4d3ebd3658d8 ("coreisght: tmc: Claim device before use")
> Cc: Suzuki Poulose <suzuki.poulose@arm.com>
> Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
> Cc: Mike Leach <mike.leach@linaro.org>
> Cc: Robert Walker <robert.walker@arm.com>
> Signed-off-by: Leo Yan <leo.yan@linaro.org>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
> ---
> drivers/hwtracing/coresight/coresight-tmc-etf.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/hwtracing/coresight/coresight-tmc-etf.c b/drivers/hwtracing/coresight/coresight-tmc-etf.c
> index 53fc83b..5864ac5 100644
> --- a/drivers/hwtracing/coresight/coresight-tmc-etf.c
> +++ b/drivers/hwtracing/coresight/coresight-tmc-etf.c
> @@ -86,7 +86,7 @@ static void __tmc_etb_disable_hw(struct tmc_drvdata *drvdata)
>
> static void tmc_etb_disable_hw(struct tmc_drvdata *drvdata)
> {
> - coresight_disclaim_device(drvdata);
> + coresight_disclaim_device(drvdata->base);
> __tmc_etb_disable_hw(drvdata);
> }
>
>
next prev parent reply other threads:[~2018-10-19 8:38 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-19 4:56 Leo Yan
2018-10-19 8:39 ` Suzuki K Poulose [this message]
2018-10-19 15:47 ` Mathieu Poirier
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=9b6a508d-5c4b-ffd8-7f6b-3f4e6db26571@arm.com \
--to=suzuki.poulose@arm.com \
--cc=alexander.shishkin@linux.intel.com \
--cc=coresight@lists.linaro.org \
--cc=leo.yan@linaro.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mathieu.poirier@linaro.org \
--cc=mike.leach@linaro.org \
--cc=robert.walker@arm.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®