From: "Geyslan G. Bem" <geyslan@gmail.com>
To: peter.senna@gmail.com
Cc: "Geyslan G. Bem" <geyslan@gmail.com>,
linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
Alan Stern <stern@rowland.harvard.edu>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Subject: [PATCH v3 01/10] usb: host: ehci-sched: refactor scan_isoc function
Date: Sun, 13 Dec 2015 13:59:30 -0300 [thread overview]
Message-ID: <1450025981-23398-2-git-send-email-geyslan@gmail.com> (raw)
In-Reply-To: <1450025981-23398-1-git-send-email-geyslan@gmail.com>
This patch removes an infinite 'for' loop and makes use of the already
existing 'restart' tag instead, reducing one leading tab.
The comments and code were corrected conforming file coding style.
Tested by compilation only.
Caught by checkpatch:
WARNING: Too many leading tabs - consider code refactoring
Signed-off-by: Geyslan G. Bem <geyslan@gmail.com>
---
v2:
Fixes file coding indentation.
Puts 'live' variable as the first evaluation in two ifs.
v3:
Undo the conditional reordering since it's most likely.
---
drivers/usb/host/ehci-sched.c | 202 +++++++++++++++++++++---------------------
1 file changed, 101 insertions(+), 101 deletions(-)
diff --git a/drivers/usb/host/ehci-sched.c b/drivers/usb/host/ehci-sched.c
index f9a3327..e9f2ee7 100644
--- a/drivers/usb/host/ehci-sched.c
+++ b/drivers/usb/host/ehci-sched.c
@@ -2379,9 +2379,11 @@ static int sitd_submit (struct ehci_hcd *ehci, struct urb *urb,
static void scan_isoc(struct ehci_hcd *ehci)
{
- unsigned uf, now_frame, frame;
- unsigned fmask = ehci->periodic_size - 1;
- bool modified, live;
+ unsigned uf, now_frame, frame;
+ unsigned fmask = ehci->periodic_size - 1;
+ bool modified, live;
+ union ehci_shadow q, *q_p;
+ __hc32 type, *hw_p;
/*
* When running, scan from last scan point up to "now"
@@ -2399,119 +2401,117 @@ static void scan_isoc(struct ehci_hcd *ehci)
ehci->now_frame = now_frame;
frame = ehci->last_iso_frame;
- for (;;) {
- union ehci_shadow q, *q_p;
- __hc32 type, *hw_p;
restart:
- /* scan each element in frame's queue for completions */
- q_p = &ehci->pshadow [frame];
- hw_p = &ehci->periodic [frame];
- q.ptr = q_p->ptr;
- type = Q_NEXT_TYPE(ehci, *hw_p);
- modified = false;
-
- while (q.ptr != NULL) {
- switch (hc32_to_cpu(ehci, type)) {
- case Q_TYPE_ITD:
- /* If this ITD is still active, leave it for
- * later processing ... check the next entry.
- * No need to check for activity unless the
- * frame is current.
- */
- if (frame == now_frame && live) {
- rmb();
- for (uf = 0; uf < 8; uf++) {
- if (q.itd->hw_transaction[uf] &
- ITD_ACTIVE(ehci))
- break;
- }
- if (uf < 8) {
- q_p = &q.itd->itd_next;
- hw_p = &q.itd->hw_next;
- type = Q_NEXT_TYPE(ehci,
- q.itd->hw_next);
- q = *q_p;
+ /* Scan each element in frame's queue for completions */
+ q_p = &ehci->pshadow[frame];
+ hw_p = &ehci->periodic[frame];
+ q.ptr = q_p->ptr;
+ type = Q_NEXT_TYPE(ehci, *hw_p);
+ modified = false;
+
+ while (q.ptr != NULL) {
+ switch (hc32_to_cpu(ehci, type)) {
+ case Q_TYPE_ITD:
+ /*
+ * If this ITD is still active, leave it for
+ * later processing ... check the next entry.
+ * No need to check for activity unless the
+ * frame is current.
+ */
+ if (frame == now_frame && live) {
+ rmb();
+ for (uf = 0; uf < 8; uf++) {
+ if (q.itd->hw_transaction[uf] &
+ ITD_ACTIVE(ehci))
break;
- }
}
-
- /* Take finished ITDs out of the schedule
- * and process them: recycle, maybe report
- * URB completion. HC won't cache the
- * pointer for much longer, if at all.
- */
- *q_p = q.itd->itd_next;
- if (!ehci->use_dummy_qh ||
- q.itd->hw_next != EHCI_LIST_END(ehci))
- *hw_p = q.itd->hw_next;
- else
- *hw_p = cpu_to_hc32(ehci,
- ehci->dummy->qh_dma);
- type = Q_NEXT_TYPE(ehci, q.itd->hw_next);
- wmb();
- modified = itd_complete (ehci, q.itd);
- q = *q_p;
- break;
- case Q_TYPE_SITD:
- /* If this SITD is still active, leave it for
- * later processing ... check the next entry.
- * No need to check for activity unless the
- * frame is current.
- */
- if (((frame == now_frame) ||
- (((frame + 1) & fmask) == now_frame))
- && live
- && (q.sitd->hw_results &
- SITD_ACTIVE(ehci))) {
-
- q_p = &q.sitd->sitd_next;
- hw_p = &q.sitd->hw_next;
+ if (uf < 8) {
+ q_p = &q.itd->itd_next;
+ hw_p = &q.itd->hw_next;
type = Q_NEXT_TYPE(ehci,
- q.sitd->hw_next);
+ q.itd->hw_next);
q = *q_p;
break;
}
+ }
+
+ /*
+ * Take finished ITDs out of the schedule
+ * and process them: recycle, maybe report
+ * URB completion. HC won't cache the
+ * pointer for much longer, if at all.
+ */
+ *q_p = q.itd->itd_next;
+ if (!ehci->use_dummy_qh ||
+ q.itd->hw_next != EHCI_LIST_END(ehci))
+ *hw_p = q.itd->hw_next;
+ else
+ *hw_p = cpu_to_hc32(ehci, ehci->dummy->qh_dma);
+ type = Q_NEXT_TYPE(ehci, q.itd->hw_next);
+ wmb();
+ modified = itd_complete(ehci, q.itd);
+ q = *q_p;
+ break;
+ case Q_TYPE_SITD:
+ /*
+ * If this SITD is still active, leave it for
+ * later processing ... check the next entry.
+ * No need to check for activity unless the
+ * frame is current.
+ */
+ if (((frame == now_frame) ||
+ (((frame + 1) & fmask) == now_frame))
+ && live
+ && (q.sitd->hw_results & SITD_ACTIVE(ehci))) {
- /* Take finished SITDs out of the schedule
- * and process them: recycle, maybe report
- * URB completion.
- */
- *q_p = q.sitd->sitd_next;
- if (!ehci->use_dummy_qh ||
- q.sitd->hw_next != EHCI_LIST_END(ehci))
- *hw_p = q.sitd->hw_next;
- else
- *hw_p = cpu_to_hc32(ehci,
- ehci->dummy->qh_dma);
+ q_p = &q.sitd->sitd_next;
+ hw_p = &q.sitd->hw_next;
type = Q_NEXT_TYPE(ehci, q.sitd->hw_next);
- wmb();
- modified = sitd_complete (ehci, q.sitd);
q = *q_p;
break;
- default:
- ehci_dbg(ehci, "corrupt type %d frame %d shadow %p\n",
- type, frame, q.ptr);
- // BUG ();
- /* FALL THROUGH */
- case Q_TYPE_QH:
- case Q_TYPE_FSTN:
- /* End of the iTDs and siTDs */
- q.ptr = NULL;
- break;
}
- /* assume completion callbacks modify the queue */
- if (unlikely(modified && ehci->isoc_count > 0))
- goto restart;
- }
-
- /* Stop when we have reached the current frame */
- if (frame == now_frame)
+ /*
+ * Take finished SITDs out of the schedule
+ * and process them: recycle, maybe report
+ * URB completion.
+ */
+ *q_p = q.sitd->sitd_next;
+ if (!ehci->use_dummy_qh ||
+ q.sitd->hw_next != EHCI_LIST_END(ehci))
+ *hw_p = q.sitd->hw_next;
+ else
+ *hw_p = cpu_to_hc32(ehci, ehci->dummy->qh_dma);
+ type = Q_NEXT_TYPE(ehci, q.sitd->hw_next);
+ wmb();
+ modified = sitd_complete(ehci, q.sitd);
+ q = *q_p;
break;
+ default:
+ ehci_dbg(ehci, "corrupt type %d frame %d shadow %p\n",
+ type, frame, q.ptr);
+ /* BUG(); */
+ /* FALL THROUGH */
+ case Q_TYPE_QH:
+ case Q_TYPE_FSTN:
+ /* End of the iTDs and siTDs */
+ q.ptr = NULL;
+ break;
+ }
- /* The last frame may still have active siTDs */
- ehci->last_iso_frame = frame;
- frame = (frame + 1) & fmask;
+ /* Assume completion callbacks modify the queue */
+ if (unlikely(modified && ehci->isoc_count > 0))
+ goto restart;
}
+
+ /* Stop when we have reached the current frame */
+ if (frame == now_frame)
+ return;
+
+ /* The last frame may still have active siTDs */
+ ehci->last_iso_frame = frame;
+ frame = (frame + 1) & fmask;
+
+ goto restart;
}
--
2.6.3
next prev parent reply other threads:[~2015-12-13 17:00 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-13 16:59 [PATCH v3 00/10] usb: host: ehci-sched: cleanup Geyslan G. Bem
2015-12-13 16:59 ` Geyslan G. Bem [this message]
2015-12-13 16:59 ` [PATCH v3 02/10] usb: host: ehci-sched: move constants to right Geyslan G. Bem
2015-12-13 16:59 ` [PATCH v3 03/10] usb: host: ehci-sched: remove useless initializations Geyslan G. Bem
2015-12-13 16:59 ` [PATCH v3 04/10] usb: host: ehci-sched: add spaces around operators Geyslan G. Bem
2015-12-13 16:59 ` [PATCH v3 05/10] usb: host: ehci-sched: remove prohibited spaces Geyslan G. Bem
2015-12-13 16:59 ` [PATCH v3 06/10] usb: host: ehci-sched: remove useless else branch Geyslan G. Bem
2015-12-13 16:59 ` [PATCH v3 07/10] usb: host: ehci-sched: use C89-style comments Geyslan G. Bem
2015-12-13 16:59 ` [PATCH v3 08/10] usb: host: ehci-sched: add line after declarations Geyslan G. Bem
2015-12-13 16:59 ` [PATCH v3 09/10] usb: host: ehci-sched: use sizeof operator with parens Geyslan G. Bem
2015-12-13 16:59 ` [PATCH v3 10/10] usb: host: ehci-sched: remove unnecessary braces Geyslan G. Bem
2015-12-24 16:03 ` [PATCH v3 00/10] usb: host: ehci-sched: cleanup Geyslan G. Bem
2016-01-25 3:30 ` Greg Kroah-Hartman
2016-01-25 19:52 ` Geyslan G. Bem
2016-01-25 19:56 ` Greg Kroah-Hartman
2016-01-25 20:20 ` Geyslan G. Bem
2016-01-25 20:08 ` Alan Stern
2016-01-25 20:26 ` Geyslan G. Bem
2016-01-25 20:40 ` Alan Stern
2016-01-25 22:18 ` Geyslan G. Bem
2016-01-26 1:49 ` Geyslan G. Bem
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