Subject: [PATCH V1] Fix Regmap Block Write single-rw Mutex Deadlock

This patch is relative to linux-next repository tag next-20130927

When regmap_bulk_write() is called with the map->use_single_rw flag set
an immediate mutex deadlock happens because regmap_raw_write() is called
after obtaining the mutex and regmap_raw_write() itself then tries to
obtain the mutex as well.

It is obvious that no one other than myself tried it with a real device.
I did, but only for the purposes of an experiment and demonstration.

But even if this situation will never ever happen with a real device, it
is a bug and therefore should be fixed.

Signed-off-by: Anthony Olech <[email protected]>
---
drivers/base/regmap/regmap.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index 00152bf..6bd9294 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -1488,10 +1488,11 @@ int regmap_bulk_write(struct regmap *map, unsigned int reg, const void *val,
*/
if (map->use_single_rw) {
for (i = 0; i < val_count; i++) {
- ret = regmap_raw_write(map,
- reg + (i * map->reg_stride),
- val + (i * val_bytes),
- val_bytes);
+ ret = _regmap_raw_write(map,
+ reg + (i * map->reg_stride),
+ val + (i * val_bytes),
+ val_bytes,
+ false);
if (ret != 0)
return ret;
}
--
end-of-patch for Fix Regmap Block Write single-rw Mutex Deadlock V1


2013-10-09 17:50:09

by Mark Brown

[permalink] [raw]
Subject: Re: [PATCH V1] Fix Regmap Block Write single-rw Mutex Deadlock

On Wed, Oct 09, 2013 at 05:44:38PM +0100, Anthony Olech wrote:

Applied, thanks. Please format your patches as covered in
SubmittingPatches - use subjects appropriate to the subsystem and keep
noise like the above after the ---. I've fixed these and the strange
capitalisation when applying.


Attachments:
(No filename) (294.00 B)
signature.asc (836.00 B)
Digital signature
Download all attachments