From: Mauro Carvalho Chehab Date: Fri, 13 Dec 2013 13:35:03 +0000 (-0300) Subject: [media] dib8000: make 32 bits read atomic X-Git-Tag: v3.14-rc1~20^2~239 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5ac64ba12aca3bef18e61c866583155a3bbf81c4;p=pandora-kernel.git [media] dib8000: make 32 bits read atomic As the dvb-frontend kthread can be called anytime, it can race with some get status ioctl. So, it seems better to avoid one to race with the other while reading a 32 bits register. I can't see any other reason for having a mutex there at I2C, except to provide such kind of protection, as the I2C core already has a mutex to protect I2C transfers. Note: instead of this approach, it could eventually remove the dib8000 specific mutex for it, and either group the 4 ops into one xfer or to manually control the I2C mutex. The main advantage of the current approach is that the changes are smaller and more puntual. Signed-off-by: Mauro Carvalho Chehab Cc: stable@vger.kernel.org Signed-off-by: Mauro Carvalho Chehab Acked-by: Patrick Boettcher --- Reading git-diff-tree failed