linux-stable/drivers/i2c
Christian Ruppert 38d7fadef4 i2c: designware: fix race between subsequent xfers
The designware block is not always properly disabled in the case of
transfer errors. Interrupts from aborted transfers might be handled
after the data structures for the following transfer are initialised but
before the hardware is set up. This can corrupt the data structures to
the point that the system is stuck in an infinite interrupt loop (where
FIFOs are never emptied because dev->msg_read_idx == dev->msgs_num).

This patch cleanly disables the designware-i2c hardware at the end of
every transfer, be it successful or not.

Signed-off-by: Christian Ruppert <christian.ruppert@abilis.com>
[wsa: extended the comment]
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2013-06-15 13:04:32 +02:00
..
algos Linux 3.6-rc7 2012-10-08 12:46:32 +02:00
busses i2c: designware: fix race between subsequent xfers 2013-06-15 13:04:32 +02:00
muxes Removal of GENERIC_GPIO for v3.10 2013-05-09 09:59:16 -07:00
i2c-boardinfo.c i2c: Update the FSF address 2012-03-26 21:47:19 +02:00
i2c-core.c i2c: core: make it possible to match a pure device tree driver 2013-06-12 20:39:07 +02:00
i2c-core.h i2c: Update the FSF address 2012-03-26 21:47:19 +02:00
i2c-dev.c new helper: file_inode(file) 2013-02-22 23:31:31 -05:00
i2c-mux.c i2c: Make the return type of i2c_del_mux_adapter() void 2013-04-02 07:07:32 +02:00
i2c-smbus.c i2c-smbus: Convert kzalloc to devm_kzalloc 2012-10-05 22:23:52 +02:00
i2c-stub.c i2c-stub: Move to drivers/i2c 2012-10-28 21:37:00 +01:00
Kconfig drivers/i2c: remove !S390 dependency, add missing GENERIC_HARDIRQS dependencies 2013-03-11 09:59:02 +01:00
Makefile i2c-stub: Move to drivers/i2c 2012-10-28 21:37:00 +01:00