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| author | Alexandre Belloni <alexandre.belloni@bootlin.com> | 2018-07-17 17:23:10 +0300 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2018-07-18 15:21:33 +0300 |
| commit | 66b19d762378785d1568b5650935205edfeb0503 (patch) | |
| tree | 397e6a3f84beb9f367dba8f2705ac8cf63f86893 /drivers/spi/spi-davinci.c | |
| parent | 2ba87a9bcc7a10aa28af9fbf5b4354b3168366e2 (diff) | |
| download | linux-66b19d762378785d1568b5650935205edfeb0503.tar.xz | |
spi: dw: fix possible race condition
It is possible to get an interrupt as soon as it is requested. dw_spi_irq
does spi_controller_get_devdata(master) and expects it to be different than
NULL. However, spi_controller_set_devdata() is called after request_irq(),
resulting in the following crash:
CPU 0 Unable to handle kernel paging request at virtual address 00000030, epc == 8058e09c, ra == 8018ff90
[...]
Call Trace:
[<8058e09c>] dw_spi_irq+0x8/0x64
[<8018ff90>] __handle_irq_event_percpu+0x70/0x1d4
[<80190128>] handle_irq_event_percpu+0x34/0x8c
[<801901c4>] handle_irq_event+0x44/0x80
[<801951a8>] handle_level_irq+0xdc/0x194
[<8018f580>] generic_handle_irq+0x38/0x50
[<804c6924>] ocelot_irq_handler+0x104/0x1c0
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi/spi-davinci.c')
0 files changed, 0 insertions, 0 deletions