firewire: sbp2: provide fallback if mgt_ORB_timeout is missing

The Unit_Characteristics entry of an SBP-2 unit directory is not
mandatory as far as I can tell.  If it is missing, we would probably
fail to log in into the target because firewire-sbp2 would not wait for
status after it sent the login request.

The fix moves the cleanup of tgt->mgt_orb_timeout into a place where it
is executed exactly once before login, rather than 0..n times depending
on the target's config ROM.  With targets with one or more
Unit_Characteristics entries, the result is the same as before.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

1 files changed, 19 insertions, 20 deletions

diff --git a/drivers/firewire/sbp2.c b/drivers/firewire/sbp2.c
index 50f0176de615..98dbbda3ad41 100644
--- a/drivers/firewire/sbp2.c
+++ b/drivers/firewire/sbp2.c
@@ -188,14 +188,7 @@ static struct fw_device *target_device(struct sbp2_target *tgt)
 /* Impossible login_id, to detect logout attempt before successful login */
 #define INVALID_LOGIN_ID 0x10000
 
-/*
- * Per section 7.4.8 of the SBP-2 spec, a mgt_ORB_timeout value can be
- * provided in the config rom. Most devices do provide a value, which
- * we'll use for login management orbs, but with some sane limits.
- */
-#define SBP2_MIN_LOGIN_ORB_TIMEOUT      5000U   /* Timeout in ms */
-#define SBP2_MAX_LOGIN_ORB_TIMEOUT      40000U  /* Timeout in ms */
-#define SBP2_ORB_TIMEOUT                2000U   /* Timeout in ms */
+#define SBP2_ORB_TIMEOUT                2000U           /* Timeout in ms */
 #define SBP2_ORB_NULL                   0x80000000
 #define SBP2_RETRY_LIMIT                0xf             /* 15 retries */
 #define SBP2_CYCLE_LIMIT                (0xc8 << 12)    /* 200 125us cycles */
@@ -1034,7 +1027,6 @@ static int sbp2_scan_unit_dir(struct sbp2_target *tgt, u32 *directory,
 {
         struct fw_csr_iterator ci;
         int key, value;
-        unsigned int timeout;
 
         fw_csr_iterator_init(&ci, directory);
         while (fw_csr_iterator_next(&ci, &key, &value)) {
@@ -1059,17 +1051,7 @@ static int sbp2_scan_unit_dir(struct sbp2_target *tgt, u32 *directory,
 
                 case SBP2_CSR_UNIT_CHARACTERISTICS:
                         /* the timeout value is stored in 500ms units */
-                        timeout = ((unsigned int) value >> 8 & 0xff) * 500;
-                        timeout = max(timeout, SBP2_MIN_LOGIN_ORB_TIMEOUT);
-                        tgt->mgt_orb_timeout =
-                                  min(timeout, SBP2_MAX_LOGIN_ORB_TIMEOUT);
-
-                        if (timeout > tgt->mgt_orb_timeout)
-                                fw_notify("%s: config rom contains %ds "
-                                          "management ORB timeout, limiting "
-                                          "to %ds\n", tgt->bus_id,
-                                          timeout / 1000,
-                                          tgt->mgt_orb_timeout / 1000);
+                        tgt->mgt_orb_timeout = (value >> 8 & 0xff) * 500;
                         break;
 
                 case SBP2_CSR_LOGICAL_UNIT_NUMBER:
@@ -1087,6 +1069,22 @@ static int sbp2_scan_unit_dir(struct sbp2_target *tgt, u32 *directory,
         return 0;
 }
 
+/*
+ * Per section 7.4.8 of the SBP-2 spec, a mgt_ORB_timeout value can be
+ * provided in the config rom. Most devices do provide a value, which
+ * we'll use for login management orbs, but with some sane limits.
+ */
+static void sbp2_clamp_management_orb_timeout(struct sbp2_target *tgt)
+{
+        unsigned int timeout = tgt->mgt_orb_timeout;
+
+        if (timeout > 40000)
+                fw_notify("%s: %ds mgt_ORB_timeout limited to 40s\n",
+                          tgt->bus_id, timeout / 1000);
+
+        tgt->mgt_orb_timeout = clamp_val(timeout, 5000, 40000);
+}
+
 static void sbp2_init_workarounds(struct sbp2_target *tgt, u32 model,
                                   u32 firmware_revision)
 {
@@ -1171,6 +1169,7 @@ static int sbp2_probe(struct device *dev)
                                &firmware_revision) < 0)
                 goto fail_tgt_put;
 
+        sbp2_clamp_management_orb_timeout(tgt);
         sbp2_init_workarounds(tgt, model, firmware_revision);
 
         /*