diff options
| author | David Brownell | 2009-06-30 20:41:30 +0200 |
|---|---|---|
| committer | Linus Torvalds | 2009-07-01 03:56:00 +0200 |
| commit | 529ba0d9669386157457a1cb96294d2fe79b3f88 (patch) | |
| tree | 258de690144abc8b4a86424d2e888ca6f8d67917 /kernel/resource.c | |
| parent | fbdev: add mutex for fb_mmap locking (diff) | |
| download | kernel-qcow2-linux-529ba0d9669386157457a1cb96294d2fe79b3f88.tar.gz kernel-qcow2-linux-529ba0d9669386157457a1cb96294d2fe79b3f88.tar.xz kernel-qcow2-linux-529ba0d9669386157457a1cb96294d2fe79b3f88.zip | |
spi: bitbang bugfix in message setup
Bugfix to spi_bitbang infrastructure: make sure to always set transfer
parameters on the first pass through the message's per-transfer loop.
This can matter with drivers that replace the per-word or per-buffer
transfer primitives, on busses with multiple SPI devices.
Previously, this could have started messages using the settings left after
previous messages. The problem was observed when a high speed chip
(m25p80 type flash) was running very slowly because a low speed device
(avr8 microcontroller) had previously used the bus. Similar faults could
have driven the low speed device too fast, or used an unexpected word
size.
Acked-by: Steven A. Falco <sfalco@harris.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/resource.c')
0 files changed, 0 insertions, 0 deletions