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param: simple locking for sysfs-writable charp parameters

Browse source 
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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3
drivers/net/wireless/libertas/if_usb.c
View file

@ -289,10 +289,13 @@ static int if_usb_probe(struct usb_interface *intf,
}
/* Upload firmware */
kparam_block_sysfs_write(fw_name);
if (__if_usb_prog_firmware(cardp, lbs_fw_name, BOOT_CMD_FW_BY_USB)) {
kparam_unblock_sysfs_write(fw_name);
lbs_deb_usbd(&udev->dev, "FW upload failed\n");
goto err_prog_firmware;
}
kparam_unblock_sysfs_write(fw_name);
if (!(priv = lbs_add_card(cardp, &udev->dev)))
goto err_prog_firmware;

3
drivers/net/wireless/libertas_tf/if_usb.c
View file

@ -811,12 +811,15 @@ static int if_usb_prog_firmware(struct if_usb_card *cardp)
lbtf_deb_enter(LBTF_DEB_USB);
kparam_block_sysfs_write(fw_name);
ret = request_firmware(&cardp->fw, lbtf_fw_name, &cardp->udev->dev);
if (ret < 0) {
pr_err("request_firmware() failed with %#x\n", ret);
pr_err("firmware %s not found\n", lbtf_fw_name);
kparam_unblock_sysfs_write(fw_name);
goto done;
}
kparam_unblock_sysfs_write(fw_name);
if (check_fwfile_format(cardp->fw->data, cardp->fw->size))
goto release_fw;