diff options
| author | wuxu.wu <[email protected]> | 2020-01-01 11:39:41 +0800 |
|---|---|---|
| committer | Mark Brown <[email protected]> | 2020-01-03 00:59:40 +0000 |
| commit | 19b61392c5a852b4e8a0bf35aecb969983c5932d (patch) | |
| tree | ea43e3a3d0498d517ea7c6b7a9c3d70c2bcb4b8e /drivers/fpga/dfl-pci.c | |
| parent | ca59d5a51690d5b9340343dc36792a252e9414ae (diff) | |
spi: spi-dw: Add lock protect dw_spi rx/tx to prevent concurrent calls
dw_spi_irq() and dw_spi_transfer_one concurrent calls.
I find a panic in dw_writer(): txw = *(u8 *)(dws->tx), when dw->tx==null,
dw->len==4, and dw->tx_end==1.
When tpm driver's message overtime dw_spi_irq() and dw_spi_transfer_one
may concurrent visit dw_spi, so I think dw_spi structure lack of protection.
Otherwise dw_spi_transfer_one set dw rx/tx buffer and then open irq,
store dw rx/tx instructions and other cores handle irq load dw rx/tx
instructions may out of order.
[ 1025.321302] Call trace:
...
[ 1025.321319] __crash_kexec+0x98/0x148
[ 1025.321323] panic+0x17c/0x314
[ 1025.321329] die+0x29c/0x2e8
[ 1025.321334] die_kernel_fault+0x68/0x78
[ 1025.321337] __do_kernel_fault+0x90/0xb0
[ 1025.321346] do_page_fault+0x88/0x500
[ 1025.321347] do_translation_fault+0xa8/0xb8
[ 1025.321349] do_mem_abort+0x68/0x118
[ 1025.321351] el1_da+0x20/0x8c
[ 1025.321362] dw_writer+0xc8/0xd0
[ 1025.321364] interrupt_transfer+0x60/0x110
[ 1025.321365] dw_spi_irq+0x48/0x70
...
Signed-off-by: wuxu.wu <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
Diffstat (limited to 'drivers/fpga/dfl-pci.c')
0 files changed, 0 insertions, 0 deletions