From: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
This patch (as1190) makes usb-storage's "quirks=" module parameter
writable, so that users can add entries for their devices at runtime
with no need to reboot or reload usb-storage.
New codes are added for the SANE_SENSE, CAPACITY_HEURISTICS, and
CAPACITY_OK flags.
Signed-off-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
---
Documentation/kernel-parameters.txt | 7 ++
drivers/usb/storage/usb.c | 169 ++++++++++++++---------------------
2 files changed, 76 insertions(+), 100 deletions(-)
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 8eb6e35..a58fc8b 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -2396,14 +2396,21 @@ and is between 256 and 4096 characters. It is defined in the file
and Product ID values (4-digit hex numbers) and
Flags is a set of characters, each corresponding
to a common usb-storage quirk flag as follows:
+ a = SANE_SENSE (collect more than 18 bytes
+ of sense data);
c = FIX_CAPACITY (decrease the reported
device capacity by one sector);
+ h = CAPACITY_HEURISTICS (decrease the
+ reported device capacity by one
+ sector if the number is odd);
i = IGNORE_DEVICE (don't bind to this
device);
l = NOT_LOCKABLE (don't try to lock and
unlock ejectable media);
m = MAX_SECTORS_64 (don't transfer more
than 64 sectors = 32 KB at a time);
+ o = CAPACITY_OK (accept the capacity
+ reported by the device);
r = IGNORE_RESIDUE (the device reports
bogus residue values);
s = SINGLE_LUN (the device has only one
diff --git a/drivers/usb/storage/usb.c b/drivers/usb/storage/usb.c
index 80e234b..4becf49 100644
--- a/drivers/usb/storage/usb.c
+++ b/drivers/usb/storage/usb.c
@@ -111,16 +111,10 @@ static unsigned int delay_use = 5;
module_param(delay_use, uint, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(delay_use, "seconds to delay before using a new device");
-static char *quirks;
-module_param(quirks, charp, S_IRUGO);
+static char quirks[128];
+module_param_string(quirks, quirks, sizeof(quirks), S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(quirks, "supplemental list of device IDs and their quirks");
-struct quirks_entry {
- u16 vid, pid;
- u32 fflags;
-};
-static struct quirks_entry *quirks_list, *quirks_end;
-
/*
* The entries in this table correspond, line for line,
@@ -481,28 +475,80 @@ static int associate_dev(struct us_data *us, struct usb_interface *intf)
return 0;
}
+/* Works only for digits and letters, but small and fast */
+#define TOLOWER(x) ((x) | 0x20)
+
/* Adjust device flags based on the "quirks=" module parameter */
static void adjust_quirks(struct us_data *us)
{
- u16 vid, pid;
- struct quirks_entry *q;
- unsigned int mask = (US_FL_FIX_CAPACITY | US_FL_IGNORE_DEVICE |
+ char *p;
+ u16 vid = le16_to_cpu(us->pusb_dev->descriptor.idVendor);
+ u16 pid = le16_to_cpu(us->pusb_dev->descriptor.idProduct);
+ unsigned f = 0;
+ unsigned int mask = (US_FL_SANE_SENSE | US_FL_FIX_CAPACITY |
+ US_FL_CAPACITY_HEURISTICS | US_FL_IGNORE_DEVICE |
US_FL_NOT_LOCKABLE | US_FL_MAX_SECTORS_64 |
- US_FL_IGNORE_RESIDUE | US_FL_SINGLE_LUN |
- US_FL_NO_WP_DETECT);
-
- vid = le16_to_cpu(us->pusb_dev->descriptor.idVendor);
- pid = le16_to_cpu(us->pusb_dev->descriptor.idProduct);
-
- for (q = quirks_list; q != quirks_end; ++q) {
- if (q->vid == vid && q->pid == pid) {
- us->fflags = (us->fflags & ~mask) | q->fflags;
- dev_info(&us->pusb_intf->dev, "Quirks match for "
- "vid %04x pid %04x: %x\n",
- vid, pid, q->fflags);
+ US_FL_CAPACITY_OK | US_FL_IGNORE_RESIDUE |
+ US_FL_SINGLE_LUN | US_FL_NO_WP_DETECT);
+
+ p = quirks;
+ while (*p) {
+ /* Each entry consists of VID:PID:flags */
+ if (vid == simple_strtoul(p, &p, 16) &&
+ *p == ':' &&
+ pid == simple_strtoul(p+1, &p, 16) &&
+ *p == ':')
break;
+
+ /* Move forward to the next entry */
+ while (*p) {
+ if (*p++ == ',')
+ break;
}
}
+ if (!*p) /* No match */
+ return;
+
+ /* Collect the flags */
+ while (*++p && *p != ',') {
+ switch (TOLOWER(*p)) {
+ case 'a':
+ f |= US_FL_SANE_SENSE;
+ break;
+ case 'c':
+ f |= US_FL_FIX_CAPACITY;
+ break;
+ case 'h':
+ f |= US_FL_CAPACITY_HEURISTICS;
+ break;
+ case 'i':
+ f |= US_FL_IGNORE_DEVICE;
+ break;
+ case 'l':
+ f |= US_FL_NOT_LOCKABLE;
+ break;
+ case 'm':
+ f |= US_FL_MAX_SECTORS_64;
+ break;
+ case 'o':
+ f |= US_FL_CAPACITY_OK;
+ break;
+ case 'r':
+ f |= US_FL_IGNORE_RESIDUE;
+ break;
+ case 's':
+ f |= US_FL_SINGLE_LUN;
+ break;
+ case 'w':
+ f |= US_FL_NO_WP_DETECT;
+ break;
+ /* Ignore unrecognized flag characters */
+ }
+ }
+ us->fflags = (us->fflags & ~mask) | f;
+ dev_info(&us->pusb_intf->dev, "Quirks match for "
+ "vid %04x pid %04x: %x\n",
+ vid, pid, f);
}
/* Find an unusual_dev descriptor (always succeeds in the current code) */
@@ -1092,88 +1138,11 @@ static struct usb_driver usb_storage_driver = {
.soft_unbind = 1,
};
-/* Works only for digits and letters, but small and fast */
-#define TOLOWER(x) ((x) | 0x20)
-
-static void __init parse_quirks(void)
-{
- int n, i;
- char *p;
-
- if (!quirks)
- return;
-
- /* Count the ':' characters to get 2 * the number of entries */
- n = 0;
- for (p = quirks; *p; ++p) {
- if (*p == ':')
- ++n;
- }
- n /= 2;
- if (n == 0)
- return; /* Don't allocate 0 bytes */
-
- quirks_list = kmalloc(n * sizeof(*quirks_list), GFP_KERNEL);
- if (!quirks_list)
- return;
-
- p = quirks;
- quirks_end = quirks_list;
- for (i = 0; i < n && *p; ++i) {
- unsigned f = 0;
-
- /* Each entry consists of VID:PID:flags */
- quirks_end->vid = simple_strtoul(p, &p, 16);
- if (*p != ':')
- goto skip_to_next;
- quirks_end->pid = simple_strtoul(p+1, &p, 16);
- if (*p != ':')
- goto skip_to_next;
-
- while (*++p && *p != ',') {
- switch (TOLOWER(*p)) {
- case 'c':
- f |= US_FL_FIX_CAPACITY;
- break;
- case 'i':
- f |= US_FL_IGNORE_DEVICE;
- break;
- case 'l':
- f |= US_FL_NOT_LOCKABLE;
- break;
- case 'm':
- f |= US_FL_MAX_SECTORS_64;
- break;
- case 'r':
- f |= US_FL_IGNORE_RESIDUE;
- break;
- case 's':
- f |= US_FL_SINGLE_LUN;
- break;
- case 'w':
- f |= US_FL_NO_WP_DETECT;
- break;
- /* Ignore unrecognized flag characters */
- }
- }
- quirks_end->fflags = f;
- ++quirks_end;
-
- skip_to_next:
- /* Entries are separated by commas */
- while (*p) {
- if (*p++ == ',')
- break;
- }
- } /* for (i = 0; ...) */
-}
-
static int __init usb_stor_init(void)
{
int retval;
printk(KERN_INFO "Initializing USB Mass Storage driver...\n");
- parse_quirks();
/* register the driver, return usb_register return code if error */
retval = usb_register(&usb_storage_driver);
--
1.6.0.4
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