tree 91e514baffe79035513185013d765fc4063a1c8c
parent 136eb955773dc99f82e6e754038eb1c530e03fdf
author Linus Walleij <triad@df.lth.se> 1209249584 +0100
committer Russell King <rmk+kernel@arm.linux.org.uk> 1209398614 +0100

[ARM] 5022/1: Race in ARM MMCI PL18x driver, V2

Updated version of 4446/1. This also drops the suggested comparison
of host_remain for == 0, since that doesn't make sense (still works
for us, too). We have verified that this patch solve race problems
on atleast 2 archs at high frequencies.

(Verbatim copy of old patch text below.)

The patch below fixes a race condition in the ARM MMCI PL18x driver.

If new data arrives in the FIFO while existing data is being read then
we get a second iteration of the loop in mmci_pio_read.

However host->size is not updated until after mmci_pio_read returns,
so we get count = number of new bytes PLUS number of bytes already
copied in the first iteration. This results in a FIFO underrun as
we try and read mode data than is available.

The fix is to compensating for data read on previous iterations
when calculating the amount of data in the FIFO.

Signed-off-by: Linus Walleij <triad@df.lth.se>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>