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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/usb/atm/ueagle-atm.c
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@ -1577,6 +1577,7 @@ static void cmvs_file_name(struct uea_softc *sc, char *const cmv_name, int ver)
char file_arr[] = "CMVxy.bin";
char *file;
kparam_block_sysfs_write(cmv_file);
/* set proper name corresponding modem version and line type */
if (cmv_file[sc->modem_index] == NULL) {
if (UEA_CHIP_VERSION(sc) == ADI930)
@ -1595,6 +1596,7 @@ static void cmvs_file_name(struct uea_softc *sc, char *const cmv_name, int ver)
strlcat(cmv_name, file, UEA_FW_NAME_MAX);
if (ver == 2)
strlcat(cmv_name, ".v2", UEA_FW_NAME_MAX);
kparam_unblock_sysfs_write(cmv_file);
}
static int request_cmvs_old(struct uea_softc *sc,