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param: simple locking for sysfs-writable charp parameters

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Since the writing to sysfs can free the old one, we need to block that
when we access the charp variables.

Signed-off-by: Rusty Russell <[email protected]>
Reviewed-by: Takashi Iwai <[email protected]>
Tested-by: Phil Carmody <[email protected]>
Cc: Jeff Dike <[email protected]>
Cc: Dan Williams <[email protected]>
Cc: John W. Linville <[email protected]>
Cc: Jing Huang <[email protected]>
Cc: James E.J. Bottomley <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Johannes Berg <[email protected]>
Cc: David S. Miller <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
This commit is contained in:
Rusty Russell 2010-08-11 23:04:27 -06:00
commit d6d1b650ae
7 changed files with 24 additions and 0 deletions
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2
drivers/scsi/bfa/bfad.c
View file

@ -788,6 +788,7 @@ bfad_drv_init(struct bfad_s *bfad)
memset(&driver_info, 0, sizeof(driver_info));
strncpy(driver_info.version, BFAD_DRIVER_VERSION,
sizeof(driver_info.version) - 1);
__kernel_param_lock();
if (host_name)
strncpy(driver_info.host_machine_name, host_name,
sizeof(driver_info.host_machine_name) - 1);
@ -797,6 +798,7 @@ bfad_drv_init(struct bfad_s *bfad)
if (os_patch)
strncpy(driver_info.host_os_patch, os_patch,
sizeof(driver_info.host_os_patch) - 1);
__kernel_param_unlock();
strncpy(driver_info.os_device_name, bfad->pci_name,
sizeof(driver_info.os_device_name - 1));