Revert "USB: EHCI: support running URB giveback in tasklet context"

This reverts commit 428aac8a81058e2303677a8fbf26670229e51d3a.

This isn't quite ready for 3.12, we need some more EHCI driver changes
that are just now showing up.  So revert this for now, and queue it up
later for 3.13.

Reported-by: Alan Stern <stern@rowland.harvard.edu>
Cc: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

14 files changed, 18 insertions, 13 deletions

diff --git a/drivers/usb/host/ehci-fsl.c b/drivers/usb/host/ehci-fsl.c
index 947b009009f1..4449f565d6c6 100644
--- a/drivers/usb/host/ehci-fsl.c
+++ b/drivers/usb/host/ehci-fsl.c
@@ -669,7 +669,7 @@ static const struct hc_driver ehci_fsl_hc_driver = {
          * generic hardware linkage
          */
         .irq = ehci_irq,
-        .flags = HCD_USB2 | HCD_MEMORY | HCD_BH,
+        .flags = HCD_USB2 | HCD_MEMORY,
 
         /*
          * basic lifecycle operations
diff --git a/drivers/usb/host/ehci-grlib.c b/drivers/usb/host/ehci-grlib.c
index b52a66ce92e8..83ab51af250f 100644
--- a/drivers/usb/host/ehci-grlib.c
+++ b/drivers/usb/host/ehci-grlib.c
@@ -43,7 +43,7 @@ static const struct hc_driver ehci_grlib_hc_driver = {
          * generic hardware linkage
          */
         .irq                    = ehci_irq,
-        .flags                  = HCD_MEMORY | HCD_USB2 | HCD_BH,
+        .flags                  = HCD_MEMORY | HCD_USB2,
 
         /*
          * basic lifecycle operations
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index 5d6022f30ebe..86ab9fd9fe9e 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -1158,7 +1158,7 @@ static const struct hc_driver ehci_hc_driver = {
          * generic hardware linkage
          */
         .irq =                  ehci_irq,
-        .flags =                HCD_MEMORY | HCD_USB2 | HCD_BH,
+        .flags =                HCD_MEMORY | HCD_USB2,
 
         /*
          * basic lifecycle operations
diff --git a/drivers/usb/host/ehci-mv.c b/drivers/usb/host/ehci-mv.c
index 417c10da9450..35cdbd88bbbe 100644
--- a/drivers/usb/host/ehci-mv.c
+++ b/drivers/usb/host/ehci-mv.c
@@ -96,7 +96,7 @@ static const struct hc_driver mv_ehci_hc_driver = {
          * generic hardware linkage
          */
         .irq = ehci_irq,
-        .flags = HCD_MEMORY | HCD_USB2 | HCD_BH,
+        .flags = HCD_MEMORY | HCD_USB2,
 
         /*
          * basic lifecycle operations
diff --git a/drivers/usb/host/ehci-octeon.c b/drivers/usb/host/ehci-octeon.c
index ab0397e4d8f3..45cc00158412 100644
--- a/drivers/usb/host/ehci-octeon.c
+++ b/drivers/usb/host/ehci-octeon.c
@@ -51,7 +51,7 @@ static const struct hc_driver ehci_octeon_hc_driver = {
          * generic hardware linkage
          */
         .irq                    = ehci_irq,
-        .flags                  = HCD_MEMORY | HCD_USB2 | HCD_BH,
+        .flags                  = HCD_MEMORY | HCD_USB2,
 
         /*
          * basic lifecycle operations
diff --git a/drivers/usb/host/ehci-pmcmsp.c b/drivers/usb/host/ehci-pmcmsp.c
index 893b707f0000..601e208bd782 100644
--- a/drivers/usb/host/ehci-pmcmsp.c
+++ b/drivers/usb/host/ehci-pmcmsp.c
@@ -286,7 +286,7 @@ static const struct hc_driver ehci_msp_hc_driver = {
 #else
         .irq =                  ehci_irq,
 #endif
-        .flags =                HCD_MEMORY | HCD_USB2 | HCD_BH,
+        .flags =                HCD_MEMORY | HCD_USB2,
 
         /*
          * basic lifecycle operations
diff --git a/drivers/usb/host/ehci-ppc-of.c b/drivers/usb/host/ehci-ppc-of.c
index 6cc5567bf9c8..932293fa32de 100644
--- a/drivers/usb/host/ehci-ppc-of.c
+++ b/drivers/usb/host/ehci-ppc-of.c
@@ -28,7 +28,7 @@ static const struct hc_driver ehci_ppc_of_hc_driver = {
          * generic hardware linkage
          */
         .irq                    = ehci_irq,
-        .flags                  = HCD_MEMORY | HCD_USB2 | HCD_BH,
+        .flags                  = HCD_MEMORY | HCD_USB2,
 
         /*
          * basic lifecycle operations
diff --git a/drivers/usb/host/ehci-ps3.c b/drivers/usb/host/ehci-ps3.c
index 8188542ba17e..fd983771b025 100644
--- a/drivers/usb/host/ehci-ps3.c
+++ b/drivers/usb/host/ehci-ps3.c
@@ -71,7 +71,7 @@ static const struct hc_driver ps3_ehci_hc_driver = {
         .product_desc           = "PS3 EHCI Host Controller",
         .hcd_priv_size          = sizeof(struct ehci_hcd),
         .irq                    = ehci_irq,
-        .flags                  = HCD_MEMORY | HCD_USB2 | HCD_BH,
+        .flags                  = HCD_MEMORY | HCD_USB2,
         .reset                  = ps3_ehci_hc_reset,
         .start                  = ehci_run,
         .stop                   = ehci_stop,
diff --git a/drivers/usb/host/ehci-q.c b/drivers/usb/host/ehci-q.c
index e321804c3475..a7f776a13eb1 100644
--- a/drivers/usb/host/ehci-q.c
+++ b/drivers/usb/host/ehci-q.c
@@ -247,6 +247,8 @@ static int qtd_copy_status (
 
 static void
 ehci_urb_done(struct ehci_hcd *ehci, struct urb *urb, int status)
+__releases(ehci->lock)
+__acquires(ehci->lock)
 {
         if (usb_pipetype(urb->pipe) == PIPE_INTERRUPT) {
                 /* ... update hc-wide periodic stats */
@@ -272,8 +274,11 @@ ehci_urb_done(struct ehci_hcd *ehci, struct urb *urb, int status)
                 urb->actual_length, urb->transfer_buffer_length);
 #endif
 
+        /* complete() can reenter this HCD */
         usb_hcd_unlink_urb_from_ep(ehci_to_hcd(ehci), urb);
+        spin_unlock (&ehci->lock);
         usb_hcd_giveback_urb(ehci_to_hcd(ehci), urb, status);
+        spin_lock (&ehci->lock);
 }
 
 static int qh_schedule (struct ehci_hcd *ehci, struct ehci_qh *qh);
diff --git a/drivers/usb/host/ehci-sead3.c b/drivers/usb/host/ehci-sead3.c
index 8a734498079b..b2de52d39614 100644
--- a/drivers/usb/host/ehci-sead3.c
+++ b/drivers/usb/host/ehci-sead3.c
@@ -55,7 +55,7 @@ const struct hc_driver ehci_sead3_hc_driver = {
          * generic hardware linkage
          */
         .irq                    = ehci_irq,
-        .flags                  = HCD_MEMORY | HCD_USB2 | HCD_BH,
+        .flags                  = HCD_MEMORY | HCD_USB2,
 
         /*
          * basic lifecycle operations
diff --git a/drivers/usb/host/ehci-sh.c b/drivers/usb/host/ehci-sh.c
index dc899eb2b861..93e59a13bc1f 100644
--- a/drivers/usb/host/ehci-sh.c
+++ b/drivers/usb/host/ehci-sh.c
@@ -36,7 +36,7 @@ static const struct hc_driver ehci_sh_hc_driver = {
          * generic hardware linkage
          */
         .irq                            = ehci_irq,
-        .flags                          = HCD_USB2 | HCD_MEMORY | HCD_BH,
+        .flags                          = HCD_USB2 | HCD_MEMORY,
 
         /*
          * basic lifecycle operations
diff --git a/drivers/usb/host/ehci-tilegx.c b/drivers/usb/host/ehci-tilegx.c
index 67026ffbf9a8..cca4be90a864 100644
--- a/drivers/usb/host/ehci-tilegx.c
+++ b/drivers/usb/host/ehci-tilegx.c
@@ -61,7 +61,7 @@ static const struct hc_driver ehci_tilegx_hc_driver = {
          * Generic hardware linkage.
          */
         .irq                    = ehci_irq,
-        .flags                  = HCD_MEMORY | HCD_USB2 | HCD_BH,
+        .flags                  = HCD_MEMORY | HCD_USB2,
 
         /*
          * Basic lifecycle operations.
diff --git a/drivers/usb/host/ehci-w90x900.c b/drivers/usb/host/ehci-w90x900.c
index 1c370dfbee0d..59e0e24c753f 100644
--- a/drivers/usb/host/ehci-w90x900.c
+++ b/drivers/usb/host/ehci-w90x900.c
@@ -108,7 +108,7 @@ static const struct hc_driver ehci_w90x900_hc_driver = {
          * generic hardware linkage
          */
         .irq = ehci_irq,
-        .flags = HCD_USB2|HCD_MEMORY|HCD_BH,
+        .flags = HCD_USB2|HCD_MEMORY,
 
         /*
          * basic lifecycle operations
diff --git a/drivers/usb/host/ehci-xilinx-of.c b/drivers/usb/host/ehci-xilinx-of.c
index 95979f9f4381..eba962e6ebfb 100644
--- a/drivers/usb/host/ehci-xilinx-of.c
+++ b/drivers/usb/host/ehci-xilinx-of.c
@@ -79,7 +79,7 @@ static const struct hc_driver ehci_xilinx_of_hc_driver = {
          * generic hardware linkage
          */
         .irq                    = ehci_irq,
-        .flags                  = HCD_MEMORY | HCD_USB2 | HCD_BH,
+        .flags                  = HCD_MEMORY | HCD_USB2,
 
         /*
          * basic lifecycle operations