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| author | Luiz Fernando Capitulino <[email protected]> | 2005-11-28 21:16:07 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <[email protected]> | 2006-01-04 21:48:35 +0000 |
| commit | 8a4613f01f5bb850cab34e3db572d97251d997b3 (patch) | |
| tree | 3ce08f8c75cf8696f7902dd33298a95016ed4e14 /drivers/usb/core/buffer.c | |
| parent | [PATCH] USB: usbserial: Adds missing checks and bug fix. (diff) | |
| download | kernel-8a4613f01f5bb850cab34e3db572d97251d997b3.tar.gz kernel-8a4613f01f5bb850cab34e3db572d97251d997b3.zip | |
[PATCH] USB: usbserial: race-condition fix.
There is a race-condition in usb-serial driver that can be triggered if
a processes does 'port->tty->driver_data = NULL' in serial_close() while
other processes is in kernel-space about to call serial_ioctl() on the
same port.
This happens because a process can open the device while there is
another one closing it.
The patch below fixes that by adding a semaphore to ensure that no
process will open the device while another process is closing it.
Note that we can't use spinlocks here, since serial_open() and
serial_close() can sleep.
Signed-off-by: Luiz Capitulino <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
Diffstat (limited to 'drivers/usb/core/buffer.c')
0 files changed, 0 insertions, 0 deletions