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Following the device's documentation guidance, reading a packet from the device or writing a packet to it must be atomic. Previously, only reading device's vacancy (before writing on it) or occupancy (before reading from it) was locked. Hence, effectively reading the packet or writing the packet wasn't locked at all. However, reading a packet (and writing one, to a lesser extent) requires to read 3 different registers in a specific order, without missing one or else we should reset the device. This patch fixes the device's locking mechanism on the FIFO character device. As the device was using copy_from_user() and copy_to_user(), we need to replace spinlocks with mutexes. Signed-off-by: Quentin Deslandes <quentin.deslandes@itdev.co.uk> Link: https://lore.kernel.org/r/20200121103958.12941-1-quentin.deslandes@itdev.co.uk Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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| axis-fifo.c | ||
| axis-fifo.txt | ||
| Kconfig | ||
| Makefile | ||
| README | ||