From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Woodhouse Subject: [PATCH v2 07/17] solos-pci: Wait for pending TX to complete when releasing vcc Date: Sun, 02 Dec 2012 00:17:49 +0000 Message-ID: <1354407469.21562.356.camel@shinybook.infradead.org> References: <1354235736-26833-1-git-send-email-dwmw2@infradead.org> <1354235736-26833-8-git-send-email-dwmw2@infradead.org> Mime-Version: 1.0 Content-Type: multipart/signed; micalg="sha1"; protocol="application/x-pkcs7-signature"; boundary="=-AZAsz9u32O4QL4crPJxk" Cc: chas@cmf.nrl.navy.mil, krzysiek@podlesie.net To: netdev@vger.kernel.org Return-path: Received: from merlin.infradead.org ([205.233.59.134]:43225 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753524Ab2LBAR7 (ORCPT ); Sat, 1 Dec 2012 19:17:59 -0500 In-Reply-To: <1354235736-26833-8-git-send-email-dwmw2@infradead.org> Sender: netdev-owner@vger.kernel.org List-ID: --=-AZAsz9u32O4QL4crPJxk Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable We should no longer be calling the old pop routine for the vcc, after vcc_release() has completed. Make sure we wait for any pending TX skbs to complete, by waiting for our own PKT_PCLOSE control skb to be sent. Signed-off-by: David Woodhouse --- v2: Don't put a struct completion into skb->cb[]. It doesn't fit, so instead use the existing card->param_wq, hold a refcount on the skb, and wait for the fpga_tx code to free it. I won't repost the rest of the series; they're materially unchanged apart from a tiny amount of massaging to make them apply with this change, so it would just be noise. drivers/atm/solos-pci.c | 17 ++++++++++++++--- 1 file changed, 14 insertions(+), 3 deletions(-) diff --git a/drivers/atm/solos-pci.c b/drivers/atm/solos-pci.c index 9851093..026bdc1 100644 --- a/drivers/atm/solos-pci.c +++ b/drivers/atm/solos-pci.c @@ -866,6 +866,7 @@ static int popen(struct atm_vcc *vcc) static void pclose(struct atm_vcc *vcc) { struct solos_card *card =3D vcc->dev->dev_data; + unsigned char port =3D SOLOS_CHAN(vcc->dev); struct sk_buff *skb; struct pkt_hdr *header; =20 @@ -881,11 +882,18 @@ static void pclose(struct atm_vcc *vcc) header->vci =3D cpu_to_le16(vcc->vci); header->type =3D cpu_to_le16(PKT_PCLOSE); =20 - fpga_queue(card, SOLOS_CHAN(vcc->dev), skb, NULL); + skb_get(skb); + fpga_queue(card, port, skb, NULL); =20 clear_bit(ATM_VF_ADDR, &vcc->flags); clear_bit(ATM_VF_READY, &vcc->flags); =20 + if (!wait_event_timeout(card->param_wq, !skb_shared(skb), 5 * HZ)) + dev_warn(&card->dev->dev, + "Timeout waiting for VCC close on port %d\n", port); + + dev_kfree_skb(skb); + /* Hold up vcc_destroy_socket() (our caller) until solos_bh() in the tasklet has finished processing any incoming packets (and, more to the point, using the vcc pointer). */ @@ -1011,9 +1019,10 @@ static uint32_t fpga_tx(struct solos_card *card) if (vcc) { atomic_inc(&vcc->stats->tx); solos_pop(vcc, oldskb); - } else + } else { dev_kfree_skb_irq(oldskb); - + wake_up(&card->param_wq); + } } } /* For non-DMA TX, write the 'TX start' bit for all four ports simultaneo= usly */ @@ -1345,6 +1354,8 @@ static struct pci_driver fpga_driver =3D { =20 static int __init solos_pci_init(void) { + BUILD_BUG_ON(sizeof(struct solos_skb_cb) > sizeof(((struct sk_buff *)0)->= cb)); + printk(KERN_INFO "Solos PCI Driver Version %s\n", VERSION); return pci_register_driver(&fpga_driver); } --=20 1.8.0 --=20 dwmw2 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