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 <[email protected]>
Cc: Mathieu Poirier <[email protected]>
Cc: Mike Leach <[email protected]>
Cc: Robert Walker <[email protected]>
Signed-off-by: Leo Yan <[email protected]>
Reviewed-by: Suzuki K Poulose <[email protected]>
---
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);
}
