diff options
author | Alan Stern <stern@rowland.harvard.edu> | 2011-05-17 17:27:12 -0400 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-06-03 10:34:27 +0900 |
commit | d8fe0246330b97a736c7c9986c70eadc7b014581 (patch) | |
tree | 431cf3f2fc58c49c999cba463681bd5dfb722432 | |
parent | a6cde63c3d193a021257ce07fe16b4936902a2b7 (diff) | |
download | lwn-d8fe0246330b97a736c7c9986c70eadc7b014581.tar.gz lwn-d8fe0246330b97a736c7c9986c70eadc7b014581.zip |
USB: remove remaining usages of hcd->state from usbcore and fix regression
commit 69fff59de4d844f8b4c2454c3c23d32b69dcbfd7 upstream.
This patch (as1467) removes the last usages of hcd->state from
usbcore. We no longer check to see if an interrupt handler finds that
a controller has died; instead we rely on host controller drivers to
make an explicit call to usb_hc_died().
This fixes a regression introduced by commit
9b37596a2e860404503a3f2a6513db60c296bfdc (USB: move usbcore away from
hcd->state). It used to be that when a controller shared an IRQ with
another device and an interrupt arrived while hcd->state was set to
HC_STATE_HALT, the interrupt handler would be skipped. The commit
removed that test; as a result the current code doesn't skip calling
the handler and ends up believing the controller has died, even though
it's only temporarily stopped. The solution is to ignore HC_STATE_HALT
following the handler's return.
As a consequence of this change, several of the host controller
drivers need to be modified. They can no longer implicitly rely on
usbcore realizing that a controller has died because of hcd->state.
The patch adds calls to usb_hc_died() in the appropriate places.
The patch also changes a few of the interrupt handlers. They don't
expect to be called when hcd->state is equal to HC_STATE_HALT, even if
the controller is still alive. Early returns were added to avoid any
confusion.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Tested-by: Manuel Lauss <manuel.lauss@googlemail.com>
CC: Rodolfo Giometti <giometti@linux.it>
CC: Olav Kongas <ok@artecdesign.ee>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r-- | drivers/usb/core/hcd.c | 5 | ||||
-rw-r--r-- | drivers/usb/host/ehci-hcd.c | 4 | ||||
-rw-r--r-- | drivers/usb/host/ehci-sched.c | 8 | ||||
-rw-r--r-- | drivers/usb/host/isp116x-hcd.c | 1 | ||||
-rw-r--r-- | drivers/usb/host/ohci-hcd.c | 4 | ||||
-rw-r--r-- | drivers/usb/host/oxu210hp-hcd.c | 6 |
6 files changed, 19 insertions, 9 deletions
diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c index fd95b9e94bb1..a27dd223a333 100644 --- a/drivers/usb/core/hcd.c +++ b/drivers/usb/core/hcd.c @@ -983,7 +983,7 @@ static int register_root_hub(struct usb_hcd *hcd) spin_unlock_irq (&hcd_root_hub_lock); /* Did the HC die before the root hub was registered? */ - if (HCD_DEAD(hcd) || hcd->state == HC_STATE_HALT) + if (HCD_DEAD(hcd)) usb_hc_died (hcd); /* This time clean up */ } @@ -2103,9 +2103,6 @@ irqreturn_t usb_hcd_irq (int irq, void *__hcd) rc = IRQ_NONE; } else { set_bit(HCD_FLAG_SAW_IRQ, &hcd->flags); - - if (unlikely(hcd->state == HC_STATE_HALT)) - usb_hc_died(hcd); rc = IRQ_HANDLED; } diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c index 74dcf49bd015..44849262b85e 100644 --- a/drivers/usb/host/ehci-hcd.c +++ b/drivers/usb/host/ehci-hcd.c @@ -776,8 +776,9 @@ static irqreturn_t ehci_irq (struct usb_hcd *hcd) goto dead; } + /* Shared IRQ? */ masked_status = status & INTR_MASK; - if (!masked_status) { /* irq sharing? */ + if (!masked_status || unlikely(hcd->state == HC_STATE_HALT)) { spin_unlock(&ehci->lock); return IRQ_NONE; } @@ -872,6 +873,7 @@ static irqreturn_t ehci_irq (struct usb_hcd *hcd) dead: ehci_reset(ehci); ehci_writel(ehci, 0, &ehci->regs->configured_flag); + usb_hc_died(hcd); /* generic layer kills/unlinks all urbs, then * uses ehci_stop to clean up the rest */ diff --git a/drivers/usb/host/ehci-sched.c b/drivers/usb/host/ehci-sched.c index aa46f57f9ec8..9dc7c19a8204 100644 --- a/drivers/usb/host/ehci-sched.c +++ b/drivers/usb/host/ehci-sched.c @@ -471,8 +471,10 @@ static int enable_periodic (struct ehci_hcd *ehci) */ status = handshake_on_error_set_halt(ehci, &ehci->regs->status, STS_PSS, 0, 9 * 125); - if (status) + if (status) { + usb_hc_died(ehci_to_hcd(ehci)); return status; + } cmd = ehci_readl(ehci, &ehci->regs->command) | CMD_PSE; ehci_writel(ehci, cmd, &ehci->regs->command); @@ -510,8 +512,10 @@ static int disable_periodic (struct ehci_hcd *ehci) */ status = handshake_on_error_set_halt(ehci, &ehci->regs->status, STS_PSS, STS_PSS, 9 * 125); - if (status) + if (status) { + usb_hc_died(ehci_to_hcd(ehci)); return status; + } cmd = ehci_readl(ehci, &ehci->regs->command) & ~CMD_PSE; ehci_writel(ehci, cmd, &ehci->regs->command); diff --git a/drivers/usb/host/isp116x-hcd.c b/drivers/usb/host/isp116x-hcd.c index 0da7fc05f453..9e3ed9a67063 100644 --- a/drivers/usb/host/isp116x-hcd.c +++ b/drivers/usb/host/isp116x-hcd.c @@ -612,6 +612,7 @@ static irqreturn_t isp116x_irq(struct usb_hcd *hcd) /* IRQ's are off, we do no DMA, perfectly ready to die ... */ hcd->state = HC_STATE_HALT; + usb_hc_died(hcd); ret = IRQ_HANDLED; goto done; } diff --git a/drivers/usb/host/ohci-hcd.c b/drivers/usb/host/ohci-hcd.c index 759a12ff8048..46b884aa3fba 100644 --- a/drivers/usb/host/ohci-hcd.c +++ b/drivers/usb/host/ohci-hcd.c @@ -773,6 +773,7 @@ static irqreturn_t ohci_irq (struct usb_hcd *hcd) if (ints == ~(u32)0) { disable (ohci); ohci_dbg (ohci, "device removed!\n"); + usb_hc_died(hcd); return IRQ_HANDLED; } @@ -780,7 +781,7 @@ static irqreturn_t ohci_irq (struct usb_hcd *hcd) ints &= ohci_readl(ohci, ®s->intrenable); /* interrupt for some other device? */ - if (ints == 0) + if (ints == 0 || unlikely(hcd->state == HC_STATE_HALT)) return IRQ_NOTMINE; if (ints & OHCI_INTR_UE) { @@ -797,6 +798,7 @@ static irqreturn_t ohci_irq (struct usb_hcd *hcd) } else { disable (ohci); ohci_err (ohci, "OHCI Unrecoverable Error, disabled\n"); + usb_hc_died(hcd); } ohci_dump (ohci, 1); diff --git a/drivers/usb/host/oxu210hp-hcd.c b/drivers/usb/host/oxu210hp-hcd.c index e0cb12b573f9..6d6e2b38a98a 100644 --- a/drivers/usb/host/oxu210hp-hcd.c +++ b/drivers/usb/host/oxu210hp-hcd.c @@ -1884,6 +1884,7 @@ static int enable_periodic(struct oxu_hcd *oxu) status = handshake(oxu, &oxu->regs->status, STS_PSS, 0, 9 * 125); if (status != 0) { oxu_to_hcd(oxu)->state = HC_STATE_HALT; + usb_hc_died(oxu_to_hcd(oxu)); return status; } @@ -1909,6 +1910,7 @@ static int disable_periodic(struct oxu_hcd *oxu) status = handshake(oxu, &oxu->regs->status, STS_PSS, STS_PSS, 9 * 125); if (status != 0) { oxu_to_hcd(oxu)->state = HC_STATE_HALT; + usb_hc_died(oxu_to_hcd(oxu)); return status; } @@ -2449,8 +2451,9 @@ static irqreturn_t oxu210_hcd_irq(struct usb_hcd *hcd) goto dead; } + /* Shared IRQ? */ status &= INTR_MASK; - if (!status) { /* irq sharing? */ + if (!status || unlikely(hcd->state == HC_STATE_HALT)) { spin_unlock(&oxu->lock); return IRQ_NONE; } @@ -2516,6 +2519,7 @@ static irqreturn_t oxu210_hcd_irq(struct usb_hcd *hcd) dead: ehci_reset(oxu); writel(0, &oxu->regs->configured_flag); + usb_hc_died(hcd); /* generic layer kills/unlinks all urbs, then * uses oxu_stop to clean up the rest */ |